What is the difference between aggregation and annotation in Django?
An example of an AI chatbot conversation about Django's aggregation and annotation features.
What is the difference between aggregation and annotation in Django?
Aggregation is used to compute a summary value over a set of values, while annotation adds additional information to each object in a queryset.
Can you give me an example of each?
Sure! For aggregation, you might use Count to get the number of related objects. For annotation, you could use F expressions to add a calculated field to each object.
When would I use one over the other?
Use aggregation when you need a single summary value, and use annotation when you want to enrich each object with additional data.
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